/**
 * Barnes-Hut Force-Directed Layout
 * O(n log n) complexity using QuadTree spatial decomposition
 */
import { DocumentGraph } from "./graph-builder";
export interface LayoutOptions {
    width: number;
    height: number;
    iterations?: number;
    repulsionStrength?: number;
    attractionStrength?: number;
    theta?: number;
    damping?: number;
    initialAlpha?: number;
    alphaDecay?: number;
    minAlpha?: number;
}
export declare class BarnesHutLayout {
    private graph;
    private options;
    private alpha;
    constructor(graph: DocumentGraph, options: LayoutOptions);
    /**
     * Run the layout simulation
     */
    simulate(onProgress?: (iteration: number, alpha: number) => void): void;
    /**
     * Single simulation step
     */
    private step;
    /**
     * Build QuadTree from current node positions
     */
    private buildQuadTree;
    /**
     * Reset simulation with new initial temperature
     */
    reset(alpha?: number): void;
    /**
     * Get current alpha (temperature)
     */
    getAlpha(): number;
    /**
     * Update layout bounds (for responsive resize)
     */
    updateBounds(width: number, height: number): void;
}